How to Setup a circuit in 9702 Electricity Practical

Main ideas / lesson conveyed

• The video demonstrates how to assemble a simple electricity circuit (9702 Electricity Practical) involving series and parallel combinations of resistors.
• It emphasizes correct wiring and connections, especially:
  • ensuring metal-to-metal contact
  • avoiding contact with plastic/insulator parts.
• It explains the function and use of:
  • a switch
  • crocodile clips
  • resistor component holders
  • resistors
  • a voltmeter
• The final setup includes:
  • a main circuit with a battery, switch, and resistors connected in the required series/parallel arrangement
  • a voltmeter connected in parallel with the element across which the voltage is to be measured.

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Method / step-by-step instructions (as presented)

1) Identify and prepare the power source

• Use a 1.5 V battery.
• Note that the battery has a positive terminal marked, and connect using the terminals as indicated.

2) Connect the battery using crocodile clips

• Attach a crocodile clip to one battery terminal.
• Leave this connection in place (do not change it once connected).

3) Set up the switch correctly

• The switch has two states:
  • Off / Open
  • On / Closed
• There are two terminals for the switch. The video advises:
  • remove the brass terminals (poor conductors)
  • use the terminal made from a better conducting material (implied: iron/steel).
• Before wiring, disconnect first to avoid improper connections.
• Connect one crocodile clip to the switch terminal, then continue building the circuit from there.

4) Build the series connection portion (connecting R then X)

• The goal is to complete the circuit by connecting the middle resistor holder labeled R.
• Use the component holder for R:
  • connect crocodile clips to the holder’s terminals (either terminal is acceptable).
• Insert the resistor into the holder:
  • ensure the exposed metal ends are used for contact
  • insert firmly
  • if contact is loose and may cause fluctuations, bend/fold the contact end slightly for better connection.
• Connect the other end of this series path back to the other battery terminal using a crocodile clip (only the metal part should touch).

5) Add the parallel part (X in parallel with R as shown)

• The circuit includes a parallel combination: R is parallel to X.
• Wire the second branch carefully:
  • correct method: connect to the metal part of the clip/resistor terminal
  • avoid the common mistake: do not connect to insulator/plastic parts.
• Insert the second resistor (X) into its holder:
  • fix it securely (e.g., “give it one turn” / ensure it’s tightly seated).
• Complete the parallel branch so that:
  • one side of X shares the same node as the appropriate end of R
  • the other side of X connects to the parallel return node.

6) Connect the voltmeter in parallel (voltage measurement)

• Connect the voltmeter across the component in parallel.
• The video explicitly states: connect the voltmeter so it is in parallel with R (given that R is in parallel with X in the arrangement).
• Voltmeter notes:
  • set it to the correct reading range
  • it may show 0.0, and an example least count is 0.01.
• Wiring the voltmeter:
  • connect one voltmeter terminal to a metal/exposed node (e.g., a metal part of a clip)
  • connect the other terminal to the other exposed metal node across the measured element
• Ensure the leads:
  • are not loose
  • do not touch plastic (use only metal nodes for proper contact).

7) Finish the circuit and take the reading

• Confirm the circuit is complete: battery + switch + resistors + voltmeter connections are correct.
• Turn the switch on by pressing tightly to close the circuit.
• When instructed by the practical, insert the required resistor value (subtitles mention an example such as “18”).
• The video concludes by instructing you to:
  • create the main circuit first
  • set up the parallel circuit
  • then measure with the voltmeter.

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Sources / speakers (and any named entities)

• AES (speaker; introduced as “my name is AES”)
• School/board context implied: “9702 Electricity Practical” (exam practical reference, not a distinct person)